Home / 20,992.90-28,971.53-11,561.47

Finding the Fourth Proportional to 20,992.90, 28,971.53 and 11,561.47

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Solution

The fourth proportional to 20,992.90, 28,971.53 and 11,561.47 is: 15,955.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,992.90 : 28,971.53 = 11,561.47 : x
  2. Step 2: Convert to fraction form
    20,992.90/28,971.53 = 11,561.47/x
  3. Step 3: Cross multiply
    20,992.90x = 28,971.53 × 11,561.47
  4. Step 4: Simplify right side
    20,992.90x = 334,953,474.95
  5. Step 5: Solve for x
    x = 334,953,474.95/20,992.90
  6. Step 6: Final answer
    x = 15,955.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.